I'm thinking of getting a unique unit advisors, but I'm having trouble deciding which one to choose... So I want to get some advice which one would be a better choice... I'm playing Celtic civilization, and Celtic has 4 unique units; Headhunter, Gaesatae, Longbowman and War Chariot. Headhunter and Gaesatae is avaliable in Silver Age, Longbowman and War Chariot is avaliable in Golden Age. If I want to get one unique unit at each age, which one will be good?